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Syntactically, there are various ways of specifying a join. The inner join example of foods and food_types illustrates performing a join implicitly in the where clause: select * from foods, food_types where foods.id=food_types.food_id; When the database sees more than one table listed, it knows there will be a join at the very least a cross join. The where clause here calls for an inner join. This implicit form, although rather clean, is actually an older form of syntax that you should avoid. The politically correct way (per SQL92) to express a join in SQL is using the join keyword. The general form is as follows: select heading from left_table join_type right_table on join_condition; This explicit form can be used for all join types. For example: select * from foods inner join food_types on foods.id=food_types.food_id; select * from foods left outer join food_types on foods.id=food_types.food_id; select * from foods cross join food_types; The most important reason for using ANSI join syntax is that there are some query types that can only be satisfied by using the join keyword-style syntax. This is particularly so for any form of outer join left, right, or full.

The Web service provides a Receive method that examines incoming SOAP request messages. All messages with an action value of PlaceTrader are dropped into the message queue. Listing 8-15 provides the code listing for the Receive method and a helper method called AddSoapMessageToQueue. Listing 8-15. A Web Service That Uses MSMQ // This class represents the Request Receiver (i.e., the service) public class StockTraderRequestReceiver : SoapReceiver { protected override void Receive(SoapEnvelope message) { if(message.Context.Addressing.Action.Value.EndsWith("PlaceTrade")) { bool status = false; // Drop the incoming SOAP message to a queue, for later processing status = AddSoapMessageToQueue(message); // Generate a return status message AcknowledgeMessage a = new AcknowledgeMessage(); a.AcceptedToQueue = status; // Transform the result into a SOAP response message SoapEnvelope response = new SoapEnvelope(); response.SetBodyObject(a); // Create the URI address objects for send and receive // Do not hardcode the URIs, pull them from original request message // Send response to the request message's ReplyTo address Uri toUri = (Uri)message.Context.Addressing.ReplyTo; // Return response from the request message's To address Uri fromUri = (Uri)message.Context.Addressing.To; // Assign the addressing SOAP message headers response.Context.Addressing.Action = new Action( "http://www.bluestonepartners.com/schemas/StockTrader/RequestQuote#PlaceTrade"); response.Context.Addressing.From = new From(fromUri); SoapSender soapSender = new SoapSender(toUri); // Send the SOAP request message soapSender.Send(response); } }

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The following is a sample of a form s code that uses all the functionality of these two components in a toolbar scenario, with a root object representing an order with some order detail children: Public Partial Class OrderMaint2 Inherits Form Public Sub New() InitializeComponent() End Sub Public Sub New(ByVal orderId As Guid) InitializeComponent() _order = OrderGetOrderWithDetail(orderId) BindUI() End Sub Private _order As Order = Nothing Private _bindingTree As BindingSourceNode = Nothing.

When joining tables, ambiguity can arise if both tables have a column with the same name. If you were to join two tables with and id column using a select id clause in the earlier code, which id should SQLite return To help with this type of task, you can qualify column names with their table names to remove any ambiguity, as you saw earlier. Another useful feature is aliases. If your table name is particularly long and you don t want to have to use its name every time you qualify a column, you can use an alias. Aliasing is actually a fundamental relational operation called rename. The rename operation simply assigns a new name to a relation. For example, consider this statement:

Private Sub BindUI() _bindingTree = BindingSourceHelper.InitializeBindingSourceTree( _ Me.components, orderBindingSource) _bindingTree.Bind(_order) End Sub Private Sub toolSave_Click(ByVal sender As Object, ByVal e As EventArgs) If Save() Then MessageBox.Show("Order saved.") End If End Sub Private Sub toolSaveNew_Click(ByVal sender As Object, ByVal e As EventArgs) If Save() Then _order = Order.NewOrder() BindUI() End If End Sub Private Sub toolSaveClose_Click(ByVal sender As Object, ByVal e As EventArgs) If Save() Then Me.Close() End If End Sub Private Sub toolCancel_Click(ByVal sender As Object, ByVal e As EventArgs) _bindingTree.Cancel(_order) End Sub Private Sub toolClose_Click(ByVal sender As Object, ByVal e As EventArgs) _bindingTree.Close() End Sub Private Function Save() As Boolean Dim ret As Boolean = False _bindingTree.Apply() Try _order = _order.Save() ret = True Catch ex As Exception MessageBox.Show(ex.Message) End Try BindUI() Return ret End Function End Class You can use the BindingSourceNode and BindingSourceHelper classes to save you a lot of code and complexity, but you re still responsible for code involving validation checking, broken rules reporting, exception handling, and, of course, the actual functionality to save or undo the object. You ll need to do this when you re using toolbars to allow users to interact with your forms, but if you re going to be using buttons or links, there is a better way.

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